import java.io.*;

public class CopyBytes {
    public static void main(String[] args) throws IOException {
        File inputFile = new File("farrago.txt");
        File outputFile = new File("outagain.txt");

        FileInputStream in = new FileInputStream(inputFile);
        DigitFilterOutputStream out = new DigitFilterOutputStream(new FileOutputStream(outputFile));

        while (in.available()!=0)
           out.write(in.read());

        in.close();
        out.close();
    }
}